share/mk/target-flags.mk

   1 # NAME:
   2 #       target-flags.mk - target specific flags
   3 #
   4 # DESCRIPTION:
   5 #       Include this macro file after all others in a makefile and
   6 #       follow it with any target specific flag settings.
   7 #       For each such variable v in TARGET_FLAG_VARS we set:
   8 #.nf
   9 #
  10 #       _$v := ${$v}
  11 #       $v = ${${v}_${.TARGET:T}:U${_$v}}
  12 #.fi
  13 #
  14 #       This allows one to do things like:
  15 #.nf
  16 #
  17 #       TARGET_FLAG_VARS= CFLAGS
  18 #       .include <target-flags.mk>
  19 #       CFLAGS_fu.o = ${_CFLAGS:N-Wall}
  20 #.fi
  21 #
  22 #       To turn off -Wall for just the target fu.o
  23 #       Actually CFLAGS is the default value for TARGET_FLAG_VARS.
  24 #
  25 # BUGS:
  26 #       One must be careful to avoid creating circular references in
  27 #       variables.  The original version of this macro file did
  28 #       elaborate things with CFLAGS.  The current, simpler
  29 #       implementation is ultimately more flexible.
  30 #
  31 #       It is important that target-flags.mk is included after other
  32 #       macro files and that target specific flags that may reference
  33 #       _$v are set after that.
  34 #
  35 #       Only works with a make(1) that does nested evaluation correctly.
  36
  37
  38
  39 # RCSid:
  40 #       $Id: target-flags.mk,v 1.9 2014/04/05 22:56:54 sjg Exp $
  41 #
  42 #       @(#) Copyright (c) 1998-2002, Simon J. Gerraty
  43 #
  44 #       This file is provided in the hope that it will
  45 #       be of use.  There is absolutely NO WARRANTY.
  46 #       Permission to copy, redistribute or otherwise
  47 #       use this file is hereby granted provided that
  48 #       the above copyright notice and this notice are
  49 #       left intact.
  50 #
  51 #       Please send copies of changes and bug-fixes to:
  52 #       sjg@crufty.net
  53 #
  54
  55 TARGET_FLAG_VARS?= CFLAGS
  56 .for v in ${TARGET_FLAG_VARS}
  57 .ifndef _$v
  58 _$v := ${$v}
  59 $v  =  ${${v}_${.TARGET:T}:U${_$v}}
  60 .endif
  61 .endfor
  62